How can I clean construction site debris from my car exterior?

There is a construction site adjacent to my house and I keep my car parked in an outdoor parking lot. Debris from the construction site has been falling on my car and whenever I go for a car wash, debris remains on the paint and on the windows of my car. I don't know exactly what the substance is that's sticking to the vehicle, but I'm wondering if anybody has any suggestions as to how to remove this debris from the exterior of my car. Thanks!

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